1/2x+y=9 - solution

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Solution for 1/2x+y=9 equation:

x in (-oo:+oo)

(1/2)*x+y = 9 // - 9

(1/2)*x+y-9 = 0

1/2*x+y-9 = 0 // - y-9

1/2*x = -(y-9) // : 1/2

x = (-(y-9))/1/2

x = 2*(9-y)

x = 2*(9-y)

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